Power station generator set transformation

What is a generator step-up transformer?

With a core-formed transformer, cylindrical leg windings cover the core legs. Hitachi Energy offers generator step-up transformers (GSU), which are the critical link between the power station and the transmission network, often operated day and night at full load.

Where are Generator Step-Up Transformers made?

Prolec Energy manufactures Generator Step-Up (GSU) Transformers in our Mexico, United States, and Brazil facilities. These transformers are directly connected to generators and step up the voltage to match the transmission system.

What is a generator step-up transformer (GSU)?

The generator step-up transformer (GSU) takes the voltage from the generator voltage level up to the suitable transmission voltage level. These GSU transformers are located in a power station and are built as single-phase or three-phase units. There are two (2) basic technologies for designing and manufacturing: core and shell.

What is a generator transformer?

The generator transformer is the one transformer on a power station for which no standby is provided. It must be available for the generator output to be connected to the grid. For a high merit unit, high reliability is required. If its output were lost, this would necessitate running less efficient plant which is more expensive to operate.

Can a power transformer be connected directly to a generator?

Power transformers connected directly to generators can experience excitation and short-circuit conditions beyond the requirements defined by ANSI/IEEE standards. Special design considerations may be necessary to ensure that a power transformer is capable of withstanding the abnormal thermal and mechanical aspects that such conditions can create.

Where should a generator transformer be positioned?

The HV side of the unit transformer is teed straight off the main connections, so this transformer should be positioned very close to the generator transformer (see Fig 2.46). Its compound is equipped with high pressure water spray fire protection, bund walls, and drainage into an oil/water separator.